Nikon D810 - Page 354

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❚❚ Auto FP High-Speed Sync
When 1/320 s (Auto FP) or 1/250 s (Auto FP) is selected for
Custom Setting e1 (Flash sync speed, 0 329), the built-in flash
can be used at shutter speeds as fast as
1
/ 320 s or
1
/ 250 s, while
compatible optional flash units ( 0 430) can be used at any
shutter speed (Auto FP High-Speed Sync).
Flash sync speed 1/320 s (Auto FP) 1/250 s (Auto FP) 1/250 s
Shutter speed
Built-in
flash
Optional
flash unit
Built-in
flash
Optional
flash unit
Built-in
flash
Optional
flash unit
From
1
/ 8000 to but not
including
1
/ 320 s
— Auto FP — Auto FP — —
From
1
/ 320 to but not
including
1
/ 250 s
Flash sync
*
— Auto FP — —
1
/ 250–30 s Flash sync
* Flash range drops as shutter speed increases.
Flash range will nevertheless be greater than that
obtained at the same speeds with Auto FP.
D The Flash-Ready Indicator
When the flash fires at full power, the flash-indicator in the camera
viewfinder will flash to warn that the resulting photograph may be
underexposed.
Note that the flash-ready indicators on optional flash
units will not display this warning when 1/320 s (Auto FP) is selected.